package com.wjq.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.wjq.reggie.common.BaseContext;
import com.wjq.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 * @ProjectName: reggie_take_out
 * @Package: com.wjq.reggie.filter
 * @ClassName: LoginCheckFilter
 * @Author: 10980
 * @Description: ${description}
 * @Date: 2022/8/19 10:38
 * @Version: 1.0
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        /**
         * 1.获取本次请求的uri
         * 2.判断本次请求是否需要处理
         * 3.如果不需要处理，直接放行
         * 4.判断登录状态，如果已登录，放行
         * 5.未登录返回未登录结果
         */
        //1.获取本次请求的uri
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，如果已登录，放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            //输出当前线程id
            long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;
        }
        //        4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //5.未登录返回未登录结果,通过输出流方式向客户端页面响应数据,通过R对象转成json再通过write写回。
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查1本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI){

        for (String url :
                urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
